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2. Does sunscreen expire? Should you wear it indoors ... - AOL

   www.aol.com/lifestyle/does-sunscreen-expire-wear...

   What does SPF mean — and which one should you use? The SPF, or sun protection factor, measures how well sunscreen protects against sunburn , according to the American Academy of Dermatology (AAD).

3. We asked a dermatologist the most common questions about SPF ...

   www.aol.com/lifestyle/asked-dermatologist-most...

   As SPF levels increase beyond 50, the formulations tend to be thicker and leave a chalkier appearance, and most people will under compensate that white chalkiness by not utilizing the right amount ...

4. 5 common sunscreen mistakes to avoid this summer ... - AOL

   www.aol.com/5-common-sunscreen-mistakes-avoid...

   You think that mineral sunscreens are the most effective. But in reality, both chemical and mineral sunscreens are equally as effective. What really makes a difference is the SPF factor.

5. Sun protective clothing - Wikipedia

   en.wikipedia.org/wiki/Sun_protective_clothing

   UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).

6. Avobenzone - Wikipedia

   en.wikipedia.org/wiki/Avobenzone

   According to some studies, "the most effective sunscreens contain avobenzone and titanium dioxide." [ 30 ] [ 31 ] Avobenzone can degrade faster in light in combination with mineral UV absorbers like zinc oxide and titanium dioxide, though with the right coating of the mineral particles this reaction can be reduced. [ 32 ]

7. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   UV sunlight spectrum (on a summer day in the Netherlands), along with the CIE Erythemal action spectrum. The effective spectrum is the product of the former two. The SPF can be measured by applying sunscreen to the skin of a volunteer and measuring how long it takes before sunburn occurs when exposed to an artificial sunlight source.